The Energizer Connect Smart Battery Powered Water Leak Sensor is designed to be hassle free and effective. This smart sensor has a built-in audible alarm which sounds when the sensor detects water. The sensor will also send an instant alert straight to your smartphone via the free Energizer Connect App (available in Google Play Store and Apple App Store). Use the Smart Scenes feature in the App to automate your Water Leak Sensor to trigger other Energizer Connect devices such as Smart Bulbs. The Sensor will also send notifications to your phone when its battery is running low.